Air-controlling device fob carbureters



A. C. FONTAINE.

AIR CONTROLLING DEVICE FOR CARBURETERS.

APPLICATION FlLED DEC. I0. I91].

1,3 1 3,478. Patented Aug. 19, 1919.

U Tn STATES PATENT orrrca.

ALBERT C, FON'TAINE, 0F MILLBURY, MASSACHUSETTS.

AIR-CONTROLLING DEVICE FOR CARBURETERS.

amaze.

Application filed December 10, 1917. semi No. 206,415.

To all whom it may concern:

Be it known that I, ALBERT C. 'FON rAINE, a citizen of the United States, residing at Millb-ury, in the county of Worcester and State of Massachusetts, have invented 'a ,new and useful Air-Controlling Device for Carbureters', of which the following is a specification.

This invention relates to a device for automatically controlling the supply of air entering the carbureter of a gasolene engine.

It has been found desirable to provide auto-,

have been heretofore devised, and it is one.

object of my invention to improve the construction of such air valves, thereby securing increased efficiency in operation.

Anotherv object of my invention is to provide means by which the opening of the valve may be manually controlled so that the valve may be held closed or may be per- ,mitted to open to any desired extent. The valve thus operates as a choker valve and permits the enriching of the mixturewhen starting the engine.

With these and other objects in view, my invention relates to certain arrangements and combinations of parts hereinafter described and more particularly pointed out in the appended claims.

A- preferred form of my invention is shown in the drawings, in which Figure 1 is a vertical sectional view of a common form of carbureter with my improved controlling device embodied therein;

Fig. 2 is afront elevation of my improved valve, lookingin the direction of the arrow 2 in Fig. 1;

Fig. 3 is a side view of the valve supporting sleeve;

Fig. 4 is a sectional elevation taken along the line 4-4 in Fig. 1, and

Fig. 5 is a longitudinal sectional elevation taken along the line 55 in Fig. 2. a

'I have shown'my air controlling device embodied in a carburetor of common form comprising a float chamber 10, a mixing chamber 11 a needle valve 12, and a throttle valve 13. The carburetor is connected by a Specification of Letters Patent.

. Patented Aug. 19. 1919.

pipe 11 to the intake manifold of a gas or gasolene engine, and may also be connected by a pipe 15 shown in broken lines in Fig. 1 to a heating device or hot-air stove mounted on the exhaust manifold. Whether heatedor not, the air enters the mixing chamber 11 through an intake passage 16.

My improved air controlling device is mounted in the intake passage 16, and in the form shown in the drawings comprises a to cooperate with a shaft 22 extending through the passage 16, the notches and shaft forming a detachable bayonet lock for the air controlling device.

At its outer end the sleeve20 is provided with an inwardly projecting flange 23 forming a stop for a pair of valve members 24 and 25 hinged to swing freely on a rod 26 extending transversely through the sleeve 20 and having its ends secured therein. A coil spring. 27 is secured at its opposite end by screws 28 to the valve members 24 and 25 respectively. The spring is mounted upon ,the outside of the valve members in such a way that it yieldingly resists inward movement of both of said members under the influence of the engine suction. The movement ofsaid members is thus proportioned to the suction exerted thereon. As the suction of the engine increases the members move farther inward, thus increasing the effective air opening and permitting an increased amount of air to enter the mixing chamber 1 1. As soon as the engine comes to rest the valve-members return to the closed position shown in Fig. 2. By the provision of double valve members the air open- 1ng is more easily and accurately proportioned to the engine suction than is practicable with a single swinging valve member. When a gasolene engine is started, particularly if the engine iscold, it is necessary to use a fuel mixture which is much richer in gasolene vapor. One common method of securing this result is by reducing the air supply by using a throttle" valve or other choking device in the air intake passage. Ihave herein provided means en'- abling me to use my automatic air controlling valve also. as a choker valve, said means consisting of an engaging member 30 (Figs. 1 and 5) movable longitudinally of the sleeve 20 and connected by a link 31 to an sleeve 20 snugly fitting within the passage 116 and provided with notches 21 adapted arm 32 fixed to the cross shaft 22 above mentioned. A collar 33 is secured to theouterend of the shaft 22, said collar being provided with lugs 3i and35 cooperating with a projection 36 on the carbureter to limit movement of the shaft in both directions. An arm 37 on the collar 33 may be connected for manual control from any convenient point.

In the normal operation of the mechanism v the member 30 is withdrawn to the position shown in Fig. 1, allowing the valve members 24 and 25 to swing freely in proportion to the suction of the engine. When a rich mixture is desired, as for starting the en,-.,

gine, the member 30 is advanced to the position shown in Fig. 5 in which position.

the valve members 24 and 25 are held tightly closed. If a limited amount of air only is to be admitted through the passage 16 the member 30 may be moved to any desired inter- 1 mediate position and the valve members24 and 25 will thus be permitted to open the passage to the extent desired.

It will thus appear that I have provided an exceedingly simple. air controlling device for a carbureter, and furthermore that said device is operable not only as anair controlling device. under normal conditions,

but also as a choker valve under abnormal conditions such as occur in the starting of an engine. While I have shown my invention embodied in a common form of carbureter, it will be understood-that it is applicable to any form of carbureter in which automatic air control is desired.

Having thus described byinvention, it will.

. be evident that changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of my invention as set forth in the claims, and I do not wish to be otherwise limited to the details herein disclosed, but

what I claim is- 1. An air intake device for a carbureter,

having in combination, an automatic air valve comprising a sleeve having an internal annular flange, two semi-circular hinged valve members mounted on a rod extending transversely across said intake and normally seated in a single plane against said flange, and a single tension spring having its opposite ends secured to said two hinged. members and efi'ective to yieldingly resist opening movement of both members.

2. An automatic air'intake device for a carbureter, having in combination, separate swinging valve members, yielding means to close said valve .mem-bers,andmeans operable manually. to prevent opening movement a movable element adapted to engage both of said swinging valve members, and means lected operative position.

3. An air intake device fora carburetor,

having in combination,.a cylindrical member having a bearing surface substantially normal to the axis thereof, two semi-circular hinged valve elements mounted to swing about a commonaxis transverse to the cylinof said valve members, said means including v to manually advance said element to a sedrical axis of said member, said elements ALBERT C. FONTAINE. 

